Acute Effects of a High Volume vs. High Intensity Bench Press Protocol on Electromechanical Delay and Muscle Morphology in Recreationally Trained Women

Sandro Bartolomei, Federico Nigro, Ivan Malagoli Lanzoni, Anna Lisa Mangia, Matteo Cortesi, Simone Ciacci and Silvia Fantozzi
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Sandro Bartolomei: Department of Biomedical and Neuromotor Sciences, University of Bologna, Via del Pilastro 8, 40127 Bologna, Italy
Federico Nigro: Department for Life Quality Studies, University of Bologna, 47921 Rimini, Italy
Ivan Malagoli Lanzoni: Department for Life Quality Studies, University of Bologna, 47921 Rimini, Italy
Anna Lisa Mangia: Interdepartmental Center for Industrial Research on Health Sciences & Technologies, University of Bologna, Via del Pilastro 8, 40127 Bologna, Italy
Matteo Cortesi: Department for Life Quality Studies, University of Bologna, 47921 Rimini, Italy
Simone Ciacci: Department of Biomedical and Neuromotor Sciences, University of Bologna, Via del Pilastro 8, 40127 Bologna, Italy
Silvia Fantozzi: Interdepartmental Center for Industrial Research on Health Sciences & Technologies, University of Bologna, Via del Pilastro 8, 40127 Bologna, Italy

IJERPH, 2021, vol. 18, issue 9, 1-10

Abstract: The purpose of the present investigation was to compare the acute responses on muscle architecture, electromechanical delay (EMD) and performance following a high volume (HV: 5 sets of 10 reps at 70% of 1 repetition maximum (1RM)) and a high intensity (HI: 5 sets of 3 reps at 90% of 1RM) bench press protocol in women. Eleven recreationally trained women (age = 23.3 ± 1.8 y; body weight = 59.7 ± 6.0 kg; height = 164.0 ± 6.3 cm) performed each protocol in a counterbalanced randomized order. Muscle thickness of pectoral (PEC MT) and triceps muscles (TR MT) were collected prior to and 15 min post each trial. In addition, EMD of pectoral (PEC EMD) and triceps (TR EMD) muscles were calculated during isometric bench press maximum force tests performed at the same timepoints (IBPF). Significantly greater increases in PEC MT ( p < 0.001) and TR MT ( p < 0.001) were detected following HV compared to HI. PEC EMD showed a significantly greater increase following HV compared to HI ( p = 0.039). Results of the present study indicate that the HV bench press protocol results in greater acute morphological and neuromuscular changes compared to a HI protocol in women. Evaluations of muscle morphology and electromechanical delay appear more sensitive to fatigue than maximum isometric force assessments.

Keywords: resistance exercise; electromechanical delay; muscle architecture; isometric force (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
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